EP 3012340 B1 20200506 - HT550 STEEL PLATE WITH ULTRAHIGH TOUGHNESS AND EXCELLENT WELDABILITY AND MANUFACTURING METHOD THEREFOR
Title (en)
HT550 STEEL PLATE WITH ULTRAHIGH TOUGHNESS AND EXCELLENT WELDABILITY AND MANUFACTURING METHOD THEREFOR
Title (de)
HT550-STAHLPLATTE MIT ULTRAHOHER ZÄHIGKEIT UND HERVORRAGENDER SCHWEISSBARKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER HT550 DE RÉSISTANCE ULTRAÉLEVÉE ET D'EXCELLENTE SOUDABILITÉ ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- CN 201310244712 A 20130619
- CN 2014074084 W 20140326
Abstract (en)
[origin: EP3012340A1] An HT550 steel plate with ultrahigh toughness and excellent weldability and a manufacturing method thereof are disclosed. Based on a component system with ultralow-C, high-Mn, Nb-microalloying, ultramicro Ti treatment, Mn/C is controlled in the range of 15-30, (%Si)x(%Ceq) is less than or equal to 0.050, (%C)x(%Si) is less than or equal to 0.010, (%Mo)×[(%C)+0.13(%Si)] is in the range of 0.003~0.020, the ratio Ti/N is in the range of 2.0~4.0, the steel plate is alloyed with (Cu+Ni+Mo), Ni/Cu is greater than or equal to 1.0, Ca treatment is performed, and Ca/S is in the range of 0.80~3.00; by optimizing TMCP process, the steel plate has microstructures of fine ferrite plus self-tempered bainite with an average grain size being less than or equal to 15 µm, yield strength being 460 MPa or more, tensile strength being 550-700 MPa, yield ratio being 0.85 or less, and -60 °C Charpy impact energy (single value) being 60J or more; therefore, the steel plate is capable of bearing large thermal input welding while obtaining uniform and excellent strength, toughness, and strong plasticity matching, and is especially suitable for sea bridge structures, ocean wind tower structures, ocean platform structures and hydroelectric structures.
IPC 8 full level
B22D 7/00 (2006.01); C21D 1/60 (2006.01); C21D 1/84 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 33/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01)
CPC (source: EP US)
B22D 7/00 (2013.01 - EP US); C21D 1/60 (2013.01 - EP US); C21D 1/84 (2013.01 - EP US); C21D 6/001 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 8/02 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0247 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 33/04 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3012340 A1 20160427; EP 3012340 A4 20170308; EP 3012340 B1 20200506; BR 112015027406 A2 20170829; BR 112015027406 B1 20200317; CA 2914441 A1 20141224; CA 2914441 C 20190305; CN 103320692 A 20130925; CN 103320692 B 20160706; ES 2790421 T3 20201027; JP 2016524653 A 20160818; JP 6198937 B2 20170920; KR 20150143838 A 20151223; US 10208362 B2 20190219; US 2016122844 A1 20160505; WO 2014201887 A1 20141224
DOCDB simple family (application)
EP 14813459 A 20140326; BR 112015027406 A 20140326; CA 2914441 A 20140326; CN 201310244712 A 20130619; CN 2014074084 W 20140326; ES 14813459 T 20140326; JP 2016514253 A 20140326; KR 20157032995 A 20140326; US 201414889052 A 20140326